Of course there is no such implication, nor did I make this claim. But it is absolutely true that certain people are simply better at reasoning than other people. This may be because of biological traits, educational difference, difference of habit, etc., but it is certainly true. Any experience with any human will reveal this to you, I think.
> Hawking's pontificating on metaphysics are of no more interest to me than Linus Torvald's on laptop screen resolutions or Richard Dawkin's theoretical thoughts on cosmology.
I am not at all clear why you would say this. In fact, I think you are committing an argument from authority in the reverse. You refuse to listen to this guys because you assume that they are not authorities. That's just bogus and I am sure you know that. Instead, you should listen to Hawking discuss metaphysics and decide if he is worth listening to. You would, I think, do exactly that if it were philosopher speaking.
Why should I listen to Hawking discuss metaphysics? I only have limited time, and I'm entirely unconvinced that would be a good use of it. It's not that I'm refusing, merely that I have no inclination to because I don't have any expectation of particular insight.
You might think that to be the case but there is no evidence for it being so.
Hawking's pontificating on metaphysics are of no more interest to me than Linus Torvald's on laptop screen resolutions or Richard Dawkin's theoretical thoughts on cosmology.